CN ratio measuring apparatus

摘要

A measuring apparatus (A) is provided which is capable of measuring CN ratio. The measuring apparatus has a measuring band specifying unit (3) for specifying a band under measurement; a display (4) for displaying the spectrum of levels measured in the specified band; first and second noise measuring frequency specifying units (6,7); a transmission channel selector (5); and a CN ratio calculating unit (8) for estimating a noise level at a carrier of a selected transmission channel and for calculating the CN ratio using the estimated level.